Apple’s sleep charts can feel like a nightly report card, and “core sleep” often ends up in the spotlight. Yet the science behind wearables suggests that fixating on that one stage is a distraction ...

I don’t know how or when it happened, but I have become obsessed with tracking my health data. Formerly, I would toss and turn, wondering what had caused my sleepless nights, or donned a new pair of ...

Over the years, Apple has developed a habit of observing what works in other smartwatches and fitness trackers, and then introducing similar features to the Apple Watch later. But, because it’s Apple, ...

If you use a third-party sleep tracker with your Apple Watch, you’re probably familiar with the concept of a sleep score: an index that combines signals like heart rate variation and sleep stages, to ...

What’s happened? A team at the University of Massachusetts Amherst has developed an app called BIDSleep that transforms the Apple Watch into a research-grade sleep monitoring device. Built under the ...